Radio gramophone amplifier



Dec. 28 192e. 1,612,707

W. H. DEWAR RADIO GRAMOPHONE AMBLIFIER Filed July 2la 1925 lll Patented Dele` 28, 1926 UNITED STATES 1,612,707 APATElSrr OFFICEL- WILLIAM H. DEWAR, 0F PHILADELPHIA, PENNSYLVANIMASSIGNOB To TH POOLEY CGMPANY, 0F PHILADELPHIA, PENNSYLVANIA, A CORPORATION orf-PENNSYL- VANIA.

RADIO GRAMOPHONE AMPLIFIER.

Applicattqntled 'July 21,1925. l.tertal No. 44.370

The invention relates to eahinets font-onfaining a radio eeeiviug; outfit' and a sound l'eprodueing machine ol' gramophoue.

The ohjeet of the invention is to provide means to contain the sound' repredueer and record andl also the radio outitit., nssoeiated with sound eonvefying and sound amplifying means eommunicating with4 hoth the,

- tz'ranu'iphone sound reprodueer and the radio loud speaker. In my invention, the lQouud eonreyingp; und mnplii'ying: menne eontains a partition dividing' the Same intotwo Sound amplitiers eommunieatling respeetively with the grmnophone. sound reprodueer andthe, radio loud :speaker7 said partition hempr movable to eoutrart'l or enlarge the dimensions and decrease, or increase the, sound' amplitying.; etieeti oi" either amplitier..

A preferred embodiment ot' the invention yis'shown in the aeeompanying drawings, in Whichltigol is a longitudimd seetion ot a not'. embodying;` my invention.

Fig. 2 is n front view of the upp the cabinet.

Figft is Fig. 2.

' The cabinet may he divided into any numher of suit/:dile eoi'npnrtnienls. As shown, n lower compartment fa, is, provided t'or the radio batteries;` a middle eomlmrtment b for tho radio set 1; and un upper compartmentv o for the motor-driven tut'n table (i. for the erzunophonereeord, the pivoted tone arxn e of the gramophone, and the sound amplifymg means.

Depending' troni the tloor of t'lhe upper eomlnntment. is n hl'oeltr which is hollowed outl to form two gradual y expandingy soundeonveying ehanuelnor eonduitn` y; and L.

t'nliier part of a vertieal sei-tion ou line 2t ot (lhaunel ff eommunieaten4 at, its eontfranttat end with the tone arm a. Channel h eemmunieaten` at its eontinloted end with the expended end ol' a metal Hound etniveytn' l'. the eontraeted end of the latter eonunumcating' with the. lolut lmpi-alter j of the, rudio.

ln the rear ot the upper compartment t: is a bloeit in liollowed outJ to form two short'J elntnnels {,r and z. whieh eonuuunieate re :speetively with, and. form senti-inuitions l'espeeti vely ot', the, two channels g and il, .I

Fixed within the upper compartment o is the top wall n and Side Walle-o and p of aeompound amplifying elnnnher. The top wall n slopes upward from the. l'ilock m ahove then-ouml Conduit; exits toward the upper trout. edge ot I,the eompartment. The si'de walll o and y diverge 1n their forwardv extensions. lherehy is formed an amplifyingl elnnnher whose t'limension's, measuring` later# ally and vertically, inerease from its rear Isound" entranee end to its t'ront sound exit` end. At partition or vshutter'r divideslzhe ampli tying elunnher `into two amplifiers e and f. vommuuieatingv resp'eetively with ehannein y amt/t', .'l`lie/partition, alv its` real', is )ivoted 'on a vertieal axle. and may he swuimr yinto sueh position thatfit extendsl forward parallel'to'the side walls ot the eahinet, 'or 1t; is s'wingable laterally in either direi-tion, so as to eoutruet eitlie'i:n'in-)lilielr n'ud zit. the lwame'tilne expand the other. When n'ioved,V for example, to theright ot' .itsl control .posi` tion, it. eoutraets' muplilier .sfaud expands 'amplitier Il.' A("ontrafeled amplilier s then has its side wallsextei'ulingg'ahout parallel, lult., owing;r to the iueliu'ation of the t-ixed upper wall :Mits dimensions, vertieally measured, expand gradually/from rear to front., givinga minimum amplifyingetl'eet to sound from vthe nl'amophone. By swinging' the partyitiou i' from thin eXtreme-position more or les@I vtowilrd the left, the alnlili'fying' ell'eet ol' umplitie'r s unly'lie' ineleas'ed aS letti1-ed, the maximum amplifying ell'eet. heiug;` ohtaiued when the partition is Swuntr to the extremo left ns shown in the drawing. Similurly; the an'iplit'ying ett'eety ou the sound l'rom thel radio loud speaker may' l"\'e inereased or dimiuished at. will.

' llavliugnow fully deserihed my invention,

what l'elaim and desire to protect. by Lety ters latent. is:l l l v l. ln'n raditi-gramophone rahinet, the oomhinat ion with the vturntahloand pivoted tone arm of n gramo'pluino,and the loud epeaker unitl ot a` rudio'setf. of means providingeouud ronduits communit-ating relopeetively*with said tone arni and loud speaker unit, the exit ends of said soundeonduits ming-arranged'nido hy side, and n compound amplifying,` eha'inhe'l.' communicating with said sound conduit exits, Suid-amplifying @number comprising diver ing .wallsarranged on opposite sides of sai exits und extending at substantially the same angle `relative to the center of the horn,- and an intermediate partitionextending 'from hetween :seid exits and dividing the amplifying ehznnher into twe amplifiers communicating rrspertively withsaid two conduits, said partition being' Sn'ingahle toward and frein either wsdl and to a point substantially parailel with either well to thereby contract either uniplier and simultaneously expand the other.

in .zi rzidio-grnmophene cabinet, the eenihinatien with the turn' tebleand pivoted 'tene nrin of a grznnophone, and the loud speaker unit of e radio set, of means providiing Sound conduits coinnninieating respectively w th Said tone arm and loudspeaker unit, the exit ends of said sound conduits being arranged side by side at a substantial distance back ofy the front of the cabinet, and neoxnpound amplifying chamber communireime? eating with seid sound conduit exits :1nd comprising' :i t'nrwnrdly extending tup tin-ill sloping' upward from nhove smid exits, lin Wardly extending' side walls diverging i'rmn opposite sides of said exits and extending` :it substantially the sinne :ingles n nppneite sides of the center of the amplifyingv 0hznnbei', :ind a Swinging` intermediate forwardly extending vertical partition the height of which gradually increases from rear te frontand which is pivnted 0n n, Vertical :ixis hetween seid sound exits and arranged tn he positioned substantially parallel'with either side wall.

ln testimony of which invention, l have hereunto set iny hund, at lliilndephizi, Pennsylvania, nn this th dey et Julyt 15h35.

Wirririnti n. nn'nzt n, 

